523991669 has 8 divisors (see below), whose sum is σ = 538446168. Its totient is φ = 509552640.

The previous prime is 523991653. The next prime is 523991687. The reversal of 523991669 is 966199325.

It can be written as a sum of positive squares in 4 ways, for example, as 230280625 + 293711044 = 15175^2 + 17138^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 523991669 - 2⁴ = 523991653 is a prime.

It is a super-2 number, since 2×523991669² = 549134538362811122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523991639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110189 + ... + 114845.

It is an arithmetic number, because the mean of its divisors is an integer number (67305771).

Almost surely, 2^523991669 is an apocalyptic number.

It is an amenable number.

523991669 is a deficient number, since it is larger than the sum of its proper divisors (14454499).

523991669 is a wasteful number, since it uses less digits than its factorization.

523991669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7735.

The product of its digits is 787320, while the sum is 50.

The square root of 523991669 is about 22890.8643130835. The cubic root of 523991669 is about 806.1975253070.

The spelling of 523991669 in words is "five hundred twenty-three million, nine hundred ninety-one thousand, six hundred sixty-nine".